odor removal

[monoso]

Recently I moved into a house and there is a persistent but faint odor throughout the home and have no idea what it is. I painted and changed the HVAC filters, are there people specializing in odor removal/detection? any recommendations?

[Yehudaa]

What kind of odor?

[monoso]

What kind of odor?

That is the main problem I don't know

[VacationLover]

Sewer? Mold? Is the basement worse than the upper floors?

[Joel]

Look into anything that can contain VOC

[monoso]

the basement has a  different strong smell that I can't identify but don't think it is moisture related,  and smells different than the upstairs but maybe it is connected to the smell upstairs (I have a bad dehumidifier  I hopefully will get around to getting a commercial one tomorrow and see if it helps but doubt it). The unfinished basement smell might be mothballs or some other bait but don't know how I can clean out the expansion crack on my foundation.
I have to do some research into voc

[thaber]

the basement has a  different strong smell that I can't identify but don't think it is moisture related,  and smells different than the upstairs but maybe it is connected to the smell upstairs (I have a bad dehumidifier  I hopefully will get around to getting a commercial one tomorrow and see if it helps but doubt it). The unfinished basement smell might be mothballs or some other bait but don't know how I can clean out the expansion crack on my foundation.
I have to do some research into voc

For upstairs and downstairs
Do environmental testing(mold, moisture etc.) and rent some commercial air purifiers, in that order.
Could also be a dead animal somewhere in the wall.

[VacationLover]

the basement has a  different strong smell that I can't identify but don't think it is moisture related,  and smells different than the upstairs but maybe it is connected to the smell upstairs (I have a bad dehumidifier  I hopefully will get around to getting a commercial one tomorrow and see if it helps but doubt it). The unfinished basement smell might be mothballs or some other bait but don't know how I can clean out the expansion crack on my foundation.
I have to do some research into voc

It is possible that it is sewer related, was an unlicensed plumber doing some work? Perhaps a drain without a P trap etc. Or a clogged drain, (you can have a sewer company clean the drains to rule that out.)

I really hope it is not mold/ moisture.

[monoso]

For upstairs and downstairs
Do environmental testing(mold, moisture etc.) and rent some commercial air purifiers, in that order.
Could also be a dead animal somewhere in the wall.
I had a guy come down and check for moisture, and he did not see anything. I will schedule a duct cleaning, but dont have high hopes. Dead animal smells are supposed to go away over time, and not really finding much out about VOC

[challah baker]

Was there ever any pets living in the home?